| A | B |
|---|
| light | is a form of radiant energy |
| spectrum | the range of radiant energy , arranged in order of energy or wavelength |
| concave lens | a lense that is wider at the edges than in the middle and that refracts light rays so they bend outward |
| convex lens | a lens that is wider in the middle than it is at the edges and that refracts light rays so they come together |
| frequecncy | the number of waves that pass a point in a specific length of time |
| fluorescent bulb | a lightbulb in which electricity passes through a gas taht reacts with a coating inside th bulb to produce light |
| incandescent bulb | a lightbulb in which electricity passes through a wire, which heats up and produces light |
| light year | a unit that is the distance that light travels in one year |
| medium | the substance through which something is carried or transmitted |
| opaque | blocking all light from passing; not see-through |
| translucent | allowing some light through; images are distorted |
| transparent | allows all light through; images are not distorted |
| photon | the smallest particle of light energy |
| reflection | the return of light as it bounces off something |
| refraction | the bending of light waves when they pass through one kind of matter to another |
| retina | the layer of light-sensitive cells at the back of the eye |
| spectrum | the range of radiant energy, arranged in order of energy or wavelength |
| wavelength | the distance between two consecutive peaks or troughs of a wave |
